Description of problem:
Tried to remove partition from write protected SD card.

Version-Release number of selected component:
blivet-gui-1.1

Additional info:
reporter:       libreport-2.6.3
blivet-gui.log: 
cmdline:        /bin/python3  /bin/blivet-gui
executable:     /bin/blivet-gui
hashmarkername: blivet-gui
kernel:         4.2.3-200.fc22.x86_64
product:        Fedora
release:        Fedora release 22 (Twenty Two)
type:           Python
version:        22

Truncated backtrace:
Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/blivetgui/blivetgui.py", line 493, in delete_selected_partition
    self._reraise_exception(result.exception, result.traceback)
  File "/usr/lib/python3.4/site-packages/blivetgui/blivetgui.py", line 245, in _reraise_exception
    raise type(exception)(str(exception) + "\n" + traceback)
ValueError: this device's formatting cannot be modified
Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/blivetgui/blivet_utils.py", line 530, in delete_device
    ac_fmt = blivet.deviceaction.ActionDestroyFormat(blivet_device)
  File "/usr/lib/python3.4/site-packages/blivet/deviceaction.py", line 657, in __init__
    raise ValueError("this device's formatting cannot be modified")
ValueError: this device's formatting cannot be modified